Alloy powder and preparation method thereof

Abstract

The invention provides alloy powder and a preparation method thereof. The preparation method of the alloy powder comprises the following steps that complexing is carried out, wherein alloy components and citric acid are subjected to complexing in a solution, and a complexing solution is formed; gel forming is carried out, wherein polyethylene glycol is added into the complexing solution to form gel; drying is carried out, wherein the gel is subjected to drying treatment to obtain dried gel; and the dried gel is subjected to calcining treatment, reducing treatment and crushing treatment to obtain the alloy powder. The alloy powder and the preparation method thereof have the beneficial effects of being simple in process and capable of achieving precise matching and have large advantages on uniformity and economical efficiency; then, the obtained powder is subjected to short-time ball grinding on the basis of a sol-gel method, alloy elements can be subjected to solid solution better, and powder particles are smaller; compared with a traditional MA method, the alloy powder is closer to a spherical shape; and compared with a method of preparing prealloy powder through the general sol-gel method and then carrying out ball grinding, the particle size has a certain advantage.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and in particular relates to an alloy powder and a preparation method thereof. Background technique [0002] Oxide dispersion strengthened (ODS) alloy steel has good radiation resistance, high temperature mechanical properties, corrosion resistance, easy processing and other advantages, so it has become a popular material for the structural parts of the fourth generation fission reactor and future fusion reactor. Yttrium oxide, as its main dispersion strengthening phase, is the key to its excellent high temperature performance and radiation resistance performance, and the degree of dispersion of yttrium oxide becomes the key factor for the performance of ODS alloy steel. [0003] The mechanical alloying method (Mechanical Alloying, MA) is currently the mainstream and key process for the preparation of ODS steel. It is the main method for the dispersion distribution of oxide species, and...

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Problems solved by technology

During the ball milling process, the interaction between the ball powder, the ball mill tank and the balls is strong, which makes the materials in the balls and the ball mill tank easily enter the powder and cause pollution;

[0005] Secondly, the final preparation stage of mechanical alloying usually requires hot rolling or hot extrusion process, which will lead to the problem of anisotropy in the microstructure and mechanical properties of the material

[0006] In order to overcome the above problems, the improved mechanical alloying process and the new preparation process of ODS steel have become the hotspots in the preparation of ODS steel, but there are generally disadvantages that the particle size of the reinforcing oxide is too large and the strengthening effect is limited.

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